5.1 Vehicle Inspection, Tyre Safety & Equipment Rules

5.1 Vehicle Inspection, Tyre Safety & Equipment Rules

Maintaining vehicle roadworthiness and adhering to mandatory safety equipment regulations are vital components of traffic safety under Finnish traffic legislation (Tieliikennelaki). Every driver is legally responsible for ensuring that the vehicle they operate is in safe mechanical condition, correctly equipped, and prepared for environmental conditions.

Periodic Vehicle Inspection (Katsastus) Schedule

In Finland, passenger cars (Category M1) and light commercial vehicles are subject to mandatory periodic vehicle inspection (määräaikaiskatsastus). The inspection schedule is determined by the vehicle's first registration date.

Key Details of Katsastus Regulations:

• Inspection Window: A vehicle can be brought for inspection at any time within the 4-month period ending on the designated deadline date.
• Driving Prohibition: If a vehicle is not inspected by the deadline, it enters an immediate driving prohibition (käyttökielto). Driving an uninspected vehicle on public roads is illegal and results in police fines, confiscation of registration plates, and potential insurance invalidation.
• Scope of Inspection: Qualified inspectors inspect essential safety components including braking systems, steering and suspension, chassis structural integrity, lighting and signals, seat belts, emissions, and OBD diagnostic codes.

---

Mandatory Vehicle Safety Equipment

Finnish law dictates that all passenger cars operating on public roads must be equipped with specific safety items in working order:

1. Warning Triangle (Varoituskolmio): An E-approved reflective warning triangle is legally mandatory in every passenger car. In the event of a breakdown or accident:
   • On standard two-lane roads (50–80 km/h), place the triangle 50–100 meters behind the vehicle.
   • On motorways (moottoritie) or high-speed roads (100–120 km/h), place the triangle 100–150 meters or further upstream to provide adequate stopping distance for oncoming traffic.
2. Seat Belts (Turvavyöt): Approved seat belts must be present and fully operational for every designated seating position in the vehicle.
3. Lighting Systems (Valojärjestelmä): Vehicles must have fully functioning headlights (low beam/dipped and high beam/main), tail lights, brake lights, direction indicators, hazard warning lights, and a rear license plate light.
4. Audible Warning Device (Äänimerkinantolaite / Horn): A working horn is required to alert other road users of immediate danger.
5. High-Visibility Vest & Emergency Kit: While a reflective vest (huomioliivi) and first-aid kit are strongly recommended for all drivers in Finland, placing a reflective vest within easy reach in the cabin is critical when exiting a disabled vehicle on unlit roads.

---

Tyre Safety & Seasonal Tyre Regulations

Tyres are a vehicle's sole contact patch with the road surface. Maintaining proper tread depth and using seasonal tyres according to Finnish weather conditions are mandatory legal duties.

Legal Minimum Tread Depths and Safety Recommendations

Seasonal Winter Tyre Regulations

Finnish law requires the use of winter tyres (either friction tyres or studded tyres) whenever weather or road conditions require it between November 1 and March 31.

• Studded Tyres (Nastarenkaat): May be used from November 1 to March 31. Outside this calendar window, studded tyres are only permitted if weather or road conditions (snow, ice, slush) genuinely require them.
• Friction Tyres (Kitkarenkaat / Non-studded winter tyres): May be driven year-round, but using them in warm summer temperatures is discouraged due to softer rubber compounds causing increased wear and degraded braking performance on dry asphalt.

Tyre Pressure Impacts

Tyre pressure should be inspected at least once a month when tyres are cold (before driving):

• Under-inflation: Increases rolling resistance, raising fuel consumption by up to 3–5%. It causes excessive wear on the outer tyre shoulders, reduces vehicle stability during sudden evasive maneuvers, and dramatically increases the risk of aquaplaning (vesiliirto).
• Over-inflation: Reduces the tyre contact patch with the road surface, causing uneven wear down the center of the tread, reduced grip, and a harsher ride.

---

Essential Fluid Checks & Routine Maintenance

Drivers must perform regular under-hood checks to prevent mechanical failure and safety hazards:

• Engine Oil (Moottoriöljy): Check level using the dipstick when the vehicle is parked on level ground with the engine turned off and cooled down. Operating with low oil causes catastrophic engine damage.
• Engine Coolant (Jäähdytinneste): Verify level in the expansion tank between the MIN and MAX markings. Never open the pressure cap when the engine is hot to avoid severe steam burns.
• Brake Fluid (Jarruneste): Check fluid level in the reservoir. Brake fluid is hygroscopic (absorbs moisture from the air), which lowers its boiling point. Fluid should be tested and replaced every 2 years.
• Windshield Washer Fluid (Tuulilasin pesuneste): Keep reservoir topped up. In winter, use anti-freeze washer fluid rated for sub-zero temperatures (e.g., -20°C to -40°C) to prevent fluid freezing on the windshield or inside fluid lines.

---

Clearing Snow & Ice Before Driving (Talvipuhdistus)

Driving in Finnish winter conditions requires total vehicle preparation before turning the ignition key.

Legal Duty for Clear Visibility

Under Finland's Traffic Act (Tieliikennelaki), a driver must have an unobstructed field of vision in all directions. Driving with only a small cleared "porthole" on the windshield is a serious traffic safety offense subject to heavy fines or driver's license suspension.

Mandatory Pre-Drive Snow & Ice Removal Steps:

1. Windows & Windshield: Clear ALL ice, frost, and snow from the front windshield, side windows, and rear window using a scraper and brush. Ensure defrosters are operating.
2. Vehicle Roof (Auton katto): All snow and ice must be completely swept off the roof. Leaving snow on the roof is extremely hazardous:
   • When braking hard, snow can slide forward onto the windshield, completely blinding the driver.
   • At highway speeds, heavy sheets of snow or hardened ice can blow off into following traffic, shattering windshields of behind vehicles.
3. Engine Hood & Trunk: Remove snow to prevent it from blowing back onto the windshield while driving.
4. Side Mirrors & Lights: Brush snow and scrape ice off side mirrors, headlights, tail lights, indicators, and reflectors so that your vehicle can see and be clearly seen by others.